package com.isdust.jy.mbank.view;


import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.support.annotation.RequiresApi;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;

import com.isdust.jy.mbank.R;


/**
 * ViewPager实现的轮播图广告自定义视图，如京东首页的广告轮播图效果；
 * 既支持自动轮播页面也支持手势滑动切换页面
 *
 * @author caizhiming
 */
@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
public class spinner extends FrameLayout {

    public static List<Bitmap>drawables=new ArrayList<>();

    //自动轮播的时间间隔
    public final static int TIME_INTERVAL = 5;

    //自动轮播启用开关
    public final static boolean isAutoPlay = true;

    //自定义轮播图的资源ID
    private int[] imagesResIds;
    //放轮播图片的ImageView 的list
    private List<ImageView> imageViewsList;
    //放圆点的View的list
    private List<View> dotViewsList;

    private ViewPager viewPager;
    //当前轮播页
    private int currentItem = 0;
    //定时任务
    private ScheduledExecutorService scheduledExecutorService;
    //Handler
    private Handler handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            viewPager.setCurrentItem(currentItem);
        }

    };

    public spinner(Context context) {
        this(context, null);
    }

    public spinner(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public spinner(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initData();
        initUI(context);
        if (isAutoPlay) {
            startPlay();
        }

    }

    /**
     * 开始轮播图切换
     */
    private void startPlay() {
        scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        scheduledExecutorService.scheduleAtFixedRate(new SlideShowTask(), 1, 4, TimeUnit.SECONDS);
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        stopPlay();
        destoryBitmaps();
    }

    /**
     * 停止轮播图切换
     */

    private void stopPlay() {
        scheduledExecutorService.shutdown();
    }

    /**
     * 初始化相关Data
     */
    private void initData() {
        imagesResIds = new int[]{
                R.drawable.selector_nav_back_light,
                R.drawable.selector_nav_back_light,
//                R.drawable.selector_nav_back_light,
//                R.drawable.selector_nav_back_light,
//                R.drawable.selector_nav_back_light,

        };
        imageViewsList = new ArrayList<ImageView>();
        dotViewsList = new ArrayList<View>();
    }

    /**
     * 初始化Views等UI
     */
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    private void initUI(Context context) {
        LayoutInflater.from(context).inflate(R.layout.layout_slideshow, this, true);
        LinearLayout linearLayout = (LinearLayout)findViewById(R.id.dots);
        for(int i=0;i<drawables.size();i++){
//        for (int imageID : imagesResIds) {
            ImageView view = new ImageView(context);
            view.setImageBitmap(drawables.get(i));
           // view.setImageResource(imageID);
            view.setScaleType(ScaleType.FIT_XY);
            imageViewsList.add(view);
            View dot = new View(context);
            //dot.setBackgroundColor(getResources().getColor(R.color.day_colorPrimary,null));
            dot.setBackgroundResource(R.drawable.dot_selector);
            ViewPager.LayoutParams layoutParams = new ViewPager.LayoutParams();
            layoutParams.height=30;
            layoutParams.width=30;
            dot.setLayoutParams(layoutParams);
            linearLayout.addView(dot);
            dotViewsList.add(dot);
        }
        viewPager = (ViewPager) findViewById(R.id.viewPager);
        viewPager.setFocusable(true);
        viewPager.setAdapter(new MyPagerAdapter());
        viewPager.setOnPageChangeListener(new MyPageChangeListener());
    }

    /**
     * 填充ViewPager的页面适配器
     *
     * @author caizhiming
     */
    private class MyPagerAdapter extends PagerAdapter {

        @Override
        public void destroyItem(View container, int position, Object object) {
            ((ViewPager) container).removeView(imageViewsList.get(position));
        }

        @Override
        public Object instantiateItem(View container, int position) {
            ((ViewPager) container).addView(imageViewsList.get(position));
            return imageViewsList.get(position);
        }

        @Override
        public int getCount() {
            return imageViewsList.size();
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void startUpdate(View arg0) {
        }

        @Override
        public void finishUpdate(View arg0) {
        }

    }

    /**
     * ViewPager的监听器
     * 当ViewPager中页面的状态发生改变时调用
     *
     * @author caizhiming
     */
    private class MyPageChangeListener implements OnPageChangeListener {

        boolean isAutoPlay = false;

        @Override
        public void onPageScrollStateChanged(int arg0) {
            // TODO Auto-generated method stub
            switch (arg0) {
                case 1:// 手势滑动，空闲中
                    isAutoPlay = false;
                    break;
                case 2:// 界面切换中
                    isAutoPlay = true;
                    break;
                case 0:// 滑动结束，即切换完毕或者加载完毕
                    // 当前为最后一张，此时从右向左滑，则切换到第一张
                    if (viewPager.getCurrentItem() == viewPager.getAdapter().getCount() - 1 && !isAutoPlay) {
                        viewPager.setCurrentItem(0);
                    }
                    // 当前为第一张，此时从左向右滑，则切换到最后一张
                    else if (viewPager.getCurrentItem() == 0 && !isAutoPlay) {
                        viewPager.setCurrentItem(viewPager.getAdapter().getCount() - 1);
                    }
                    break;
            }
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }
        @Override
        public void onPageSelected(int pos) {
            for (int i = 0; i < dotViewsList.size(); i++)
                dotViewsList.get(i).setSelected(false);
            dotViewsList.get(pos).setSelected(true);
        }
    }

    /**
     * 执行轮播图切换任务
     *
     * @author caizhiming
     */
    private class SlideShowTask implements Runnable {

        @Override
        public void run() {
            synchronized (viewPager) {
                currentItem = (currentItem + 1) % imageViewsList.size();
                handler.obtainMessage().sendToTarget();
            }
        }
    }


    /**
     * 销毁ImageView资源，回收内存
     *
     * @author caizhiming
     */
    private void destoryBitmaps() {

        for (int i = 0; i < drawables.size(); i++) {
            ImageView imageView = imageViewsList.get(i);
            Drawable drawable = imageView.getDrawable();
            if (drawable != null) {
                //解除drawable对view的引用
                drawable.setCallback(null);
            }
        }
    }

}
